Indeed, there is insufficient evidence supporting this theory.
That being said, with the amount of galaxies there are in the universe, hundreds of billions. Each have thousands of stars very much like our Sun and most stars have planets in orbit like our own solar system; Chances of extra-terrestrial life must be high. The essence of life is water. Water is found in abundance farom Earth to even distant planetary moons like the ice covered Enceladus. The probability for intelligent lifeforms must be good.
Given the probability, it will be ignorant to claim that we are the only intelligible being in the universe that have the potential to explore space and the universe. Infact, given the probability for intelligible lifeforms, someone else may already be exploring the universe and coming into contact with other lifeforms like us.
So sure, to our extended knowledge, there is no evidence supporting the theory of extra-terrestrial beings visiting us. But with mathematical probabilities and logical assumptions, such a theory can be supported.
You are one smart/rational man!
To add my own 2 cents, I've read some of Zecharia's work. To be honest, it makes a lot of sense... more sense than a lot of "mainstream"'s science theories do. Those theories are based on [actual
translated ancient historic documentation
... not artwork or religious texts
. The rationalization used to create Zecharia's theories is more sound than the rationalization that is used to create modern theories about how the ancients made the pyramids and other ancient wonders.
You have to realize something - any theory
is constructed from what a person knows about the subject and how that person is able to "make sense" of that information. In other words, the persons opinion or feeling's on the subject can impact the person's ability to rationalilze the information clearly - thus his/her ability to make a sound/rational/TRUTHFUL
theory. In other words, ANY theory is only a person's opinion
That is why, I agree with Riddle on this. We DON'T know
that aliens are real. Nor do we know
that they aren't. Is it possible? HELL YES. Is there enough sure evidence
to prove that they exist? NO. All we have are theories - from either 'side'. All we do know is that it's possible/probable/likely.
Either way, we have to stay open minded about it, because it is [i]obviously[/] more likely that it is true than that it is not. Just my "opinion"